What Is It?
Schizophrenia is a chronic (long-lasting) brain disorder that is easily misunderstood. Although symptoms may vary widely, people with schizophrenia frequently have a hard time recognizing reality, thinking logically and behaving naturally in social situations. Schizophrenia is surprisingly common, affecting 1 in every 100 people worldwide.
Experts believe schizophrenia results from a combination of genetic and environmental causes. The chance of having schizophrenia is 10% if an immediate family member (a parent or sibling) has the illness. The risk is as high as 65% for those who have an identical twin with schizophrenia.
Scientists have identified several genes that increase the risk of getting this illness. In fact, so many problem genes have been investigated that schizophrenia can be seen as several illnesses rather than one. These genes probably affect the way the brain develops and how nerve cells communicate with one another. In a vulnerable person, a stress (such as a toxin, an infection or a nutritional deficiency) may trigger the illness during critical periods of brain development.